Perhaps you should try some spelling variations:
chiet tach » chieu sach
dang cong » dung cong
ho chiet » ho chieu, ho thiet, hoc thiet
nhan tao » nhan dan
nhan tai » hang tai, van tai, toan tai
cong dan » cong san, cong tan, huong dan
toan cao » toan tap
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - hanh ((nhan tao) or (nhan tai)) dang cong dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - hanh ((nhan tao) OR (nhan tai)) dang cong dan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh ((nhan tao) or (nhan tai)) dang cong dan ((toan cao) or (toan ban))*.